Year	% of total population ages 15+ (national estimate)
1961	54.04
1971	58.02
1976	61.503
1977	61.858
1978	62.741
1979	63.671
1980	64.27
1981	65.035
1982	64.396
1983	64.726
1984	65.047
1985	65.646
1986	66.106
1987	66.473
1988	66.849
1989	67.263
1990	67.145
1991	66.577
1992	65.701
1993	65.338
1994	65.155
1995	64.824
1996	64.673
1997	64.872
1998	65.126
1999	65.529
2000	65.762
2001	65.907
2002	66.862
2003	67.561
2004	67.487
2005	67.142
2006	67.192
2007	67.46
2008	67.596
2009	67.276
2010	67.052
2011	66.906
2012	66.844
2013	66.82
2014	66.311
2015	66.178
2016	65.923
2017	66.047
2018	65.795
2019	66.053
2020	64.319
2021	65.39
2022	65.437
2023	65.614